{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T21:43:27Z","timestamp":1792187007040,"version":"4.4.0"},"reference-count":37,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2020,7,5]],"date-time":"2020-07-05T00:00:00Z","timestamp":1593907200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2020,7,5]],"date-time":"2020-07-05T00:00:00Z","timestamp":1593907200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.springer.com\/tdm"},{"start":{"date-parts":[[2020,7,5]],"date-time":"2020-07-05T00:00:00Z","timestamp":1593907200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.springer.com\/tdm"}],"funder":[{"DOI":"10.13039\/501100009592","name":"Beijing Municipal Science & Technology Commission","doi-asserted-by":"crossref","award":["Z181100001718106"],"award-info":[{"award-number":["Z181100001718106"]}],"id":[{"id":"10.13039\/501100009592","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Beijing Natural Science Foundation","award":["L192051"],"award-info":[{"award-number":["L192051"]}]},{"name":"Capital\u2019s Funds for Health Improvement and Research","award":["2020-1-2071"],"award-info":[{"award-number":["2020-1-2071"]}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2021,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>The purpose of this study was to analyse the risk factors associated with residual graft laxity after medial patellofemoral ligament reconstruction (MPFL\u2010R) in patients with recurrent patellar dislocation (RPD).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total of 312 consecutive patients (354\u00a0knees) with clinically diagnosed RPD who underwent MPFL\u2010R from 2011 to 2015 were retrospectively analysed. Postoperative MPFL graft stability was assessed with patellofemoral stress radiography, and if the patellar central ridge surpassed the apex of the lateral femoral trochlea, the reconstructed MPFL was defined as having residual graft laxity. Finally, 15 patients who exhibited MPFL residual graft laxity (study group) were matched in a 1:2 fashion to 30 control participants (control group), who showed a normal postoperative patellar stability on stress radiography. Preoperative three\u2010dimensional computed tomography (3D\u2010CT) was used to identify patients with a high\u2010grade J\u2010sign. Femoral tunnel position was assessed using 3D\u2010CT to identify cases with femoral tunnel malposition. Potential predictors of MPFL residual graft laxity, including age, sex, a preoperative high\u2010grade J\u2010sign, femoral tunnel malposition, and several radiological parameters, were assessed by logistic regression analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A preoperative high\u2010grade J\u2010sign was identified in 66.7% of the study group, which was significantly higher than that the 13.3% in the control group (<jats:italic>P<\/jats:italic>\u2009=\u20090.001). In addition, the presence of a preoperative high\u2010grade J\u2010sign (odds ratio, 11.9 [95% CI, 1.7\u201382.8]; <jats:italic>P<\/jats:italic>\u2009=\u20090.012) and femoral tunnel malposition (odds ratio, 8.2 [95% CI, 1.2\u201358.0]; <jats:italic>P<\/jats:italic>\u2009=\u20090.036) were determined to be independent risk factors associated with residual graft laxity after MPFL\u2010R.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The presence of a preoperative high\u2010grade J\u2010sign and femoral tunnel malposition are associated with residual graft laxity after MPFL\u2010R in patients with RPD. These results may provide additional information for counselling patients on residual graft laxity after MPFL\u2010R.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>Level III.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-020-06140-z","type":"journal-article","created":{"date-parts":[[2020,7,5]],"date-time":"2020-07-05T02:02:32Z","timestamp":1593914552000},"page":"1183-1190","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["The presence of a preoperative high\u2010grade J\u2010sign and femoral tunnel malposition are associated with residual graft laxity after MPFL reconstruction"],"prefix":"10.1002","volume":"29","author":[{"given":"ZhiJun","family":"Zhang","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Service Beijing Jishuitan Hospital No. 31, Xin Jie Kou East Street, Xi Cheng District Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"GuanYang","family":"Song","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Service Beijing Jishuitan Hospital No. 31, Xin Jie Kou East Street, Xi Cheng District Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Zheng","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Service Beijing Jishuitan Hospital No. 31, Xin Jie Kou East Street, Xi Cheng District Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"QianKun","family":"Ni","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Service Beijing Jishuitan Hospital No. 31, Xin Jie Kou East Street, Xi Cheng District Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hua","family":"Feng","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> 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February 2020","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"30 June 2020","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"5 July 2020","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Compliance with ethical standards"}},{"value":"The authors declare that they have no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflicts of interest"}},{"value":"All procedures performed in this retrospective study were in accordance with the ethical standards of the Beijing Jishuitan hospital, and this study was performed after obtaining approval from our institutional review board (IRB, No. 20190601).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"All patients provided informed consent before participating in this study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"All patients provided informed consent for publication.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The datasets used or analysed during the current study are available from the corresponding author on reasonable request.","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Availability of data and material"}},{"value":"Yes.","order":7,"name":"Ethics","group":{"name":"EthicsHeading","label":"Code availability"}}]}}